CN108578804B - A kind of peritoneal dialysis trocar - Google Patents

Abstract

The invention discloses a peritoneal dialysis trocar. The key point of the technical scheme is that it includes a sleeve and a needle core. The sleeve includes two half-tubes. A fixing device for fixing the clamp is provided; the needle core includes a cutting end and an operating end, the needle core includes a needle outer core and a needle inner core, and the needle inner core includes a sliding core, a regulating core and a connecting core, and the sliding core The protrusion is provided with a cutting edge, and the cutting end is provided with an avoidance groove. When the sliding core slides into the needle outer core, the cutting edge can be embedded in the avoidance groove until the cutting edge protrudes from the outer side wall of the cutting end; the needle core is provided with The infusion channel, the cutting end is provided with a plurality of infusion holes connected with the infusion channel, and the other end of the infusion tube is sealed and connected with a negative pressure detection device for injecting detection liquid into the infusion channel. The detection fluid flows out from the infusion hole. The peritoneal dialysis trocar is easy to operate, has small incisions, and is not easy to damage organs.

Description

A kind of peritoneal dialysis trocar

technical field

The invention relates to the technical field of medical equipment, more specifically, it relates to a peritoneal dialysis trocar.

Background technique

Peritoneal dialysis is one of the most effective methods for treating acute and chronic renal failure. For a long time, peritoneal dialysis has been performed by surgically inserting catheters. Mostly, the abdominal wall is cut 3 cm below the umbilicus to the peritoneum, and the peritoneal dialysis tube is inserted into the bladder and rectum with ring forceps. crypt. There are following defects in carrying out peritoneal dialysis with this method, the one, and operation mode is complicated to operate, generally needs urologist to carry out, and the 2nd, operation time is long, and otch is long, often needs one hour to carry out this operation, and otch exists more than 5cm (especially Obese people), large trauma, slow wound healing, many complications (such as bleeding, infection, accidentally injuring viscera, abdominal wall fistula, intestinal adhesion, etc.), especially for acute and severe "acute and chronic kidney disease" with coagulation dysfunction Patients with depleted uremia are at risk for bleeding, oozing, and difficulty with hemostasis.

At the same time, after the peritoneal dialysis catheter is blocked (the protein content in the HFRS peritoneal dialysis fluid is high, it is easy to block, and if there is bleeding, it is more likely to be blocked), the flushing cannot pass, and the catheter must be re-inserted. If the catheter is re-inserted from the original incision, the abdominal cavity needs to be opened again. The wounded tissue is aggravated, and the airtightness around the dialysis tube is poor, and the dialysate may leak out of the tube, which not only affects the dialysis effect but is also prone to secondary infection. If the site is replaced and the tube is re-inserted, the patient's tissue trauma and pain will be increased. , The dialysate can extravasate from the original incision.

Contents of the invention

Aiming at the deficiencies in the prior art, the object of the present invention is to provide a peritoneal dialysis trocar with simple operation, small incision, and less likely to damage organs.

In order to achieve the above object, the present invention provides the following technical solutions: a peritoneal dialysis trocar, including a sleeve and a needle core inserted into the sleeve, the sleeve includes two symmetrically arranged sleeve half-pipes, The cross-section of the half-pipe along its length is set in a semi-circular structure, and the open ends of the two half-pipes are joined together to form a sleeve, and a clamp is sleeved on the outer wall of the sleeve. The pipe is provided with a fixing device for fixing the clamp;

The needle core includes a cutting end at the head end for cutting an incision and an operating end at the tail end for operating the needle core. When the needle core is inserted into the sleeve, the cutting end penetrates the sleeve and then extends out of the sleeve. part, and the operating end also extends from the tail end of the casing;

The needle core includes a tubular needle outer core and a needle inner core inserted into the needle outer core, the cutting end is arranged in a conical structure and is located at the end of the needle outer core, and the small diameter end of the cutting end is located at the needle The top of the outer core, the inner core of the needle includes a sliding core sliding in the outer core of the needle, a regulating core screwed with the outer core of the needle, and an axially fixed and circumferential rotation connected to the sliding core and The connecting core between the regulating cores, the regulating core includes a regulating end extending out of the needle outer core, and the regulating core can drive the sliding core along the length direction of the sliding core through the connecting core during the rotation of the needle outer core. Slip inside the outer core of the needle;

A plurality of cutting edges protrude from the outer wall of the end of the sliding core away from the connecting core. The length direction of the cutting edges is consistent with the length direction of the inner core of the needle. Outwardly extending avoidance groove, the cutting edge can be embedded in the avoidance groove when the sliding core slides into the needle outer core until the cutting edge protrudes from the outer side wall of the cutting end;

An infusion channel for infusion is arranged coaxially on the needle core. One end of the infusion channel runs through the operating end and is sealed and connected with an infusion tube, and the other end leads to the cutting end to form a blind hole structure. The cutting end is provided with a A plurality of infusion holes connected with the infusion channel;

The other end of the infusion tube is sealingly connected with a negative pressure detection device for injecting detection liquid into the infusion channel, and the negative pressure detection device can flow the detection liquid in the infusion channel out of the infusion hole.

The present invention is further configured as follows: the infusion tube includes a first infusion tube communicated with the infusion channel and a second infusion tube connected to the negative pressure detection device, and the joint of the first infusion tube for connecting the second infusion tube is provided with a coaxial The first inner tube and the first outer tube, the end face of the first inner tube is located in the first outer tube; the interface of the second infusion tube for connecting the first infusion tube is provided with a coaxial second inner tube and a second outer tube tube, the end surface of the second inner tube is located in the second outer tube, there is a first gap for the second outer tube to be inserted between the first inner tube and the first outer tube, and the second inner tube and the first outer tube There is a second gap between the two outer tubes for the insertion of the first inner tube; the second inner tube is arranged in a conical structure, and the small-diameter end of the second inner tube faces the first inner tube, and the second inner tube The outer diameter of the small-diameter end is smaller than the inner diameter of the first inner tube, and the outer diameter of the larger-diameter end of the second inner tube is greater than the inner diameter of the first inner tube; the first outer tube is used to connect to the inner side of the connecting end of the second outer tube A first fastening ring is protruded on the wall, and a second fastening ring is protruded on the outer wall of the connecting end of the second outer tube for connecting the first outer tube. When the second outer tube is inserted into the first gap After the first fastening ring slides over the second fastening ring, it is fastened with the second fastening ring, and when the first fastening ring is fastened with the second fastening ring, the tapered outer wall of the second inner tube can be connected with the first fastening ring. The open end of the inner tube remains an abutment seal.

The present invention is further configured as follows: the connection between the first infusion tube and the second infusion tube is located in the middle of the infusion tube, the first inner tube is made of medical elastic plastic, and the second inner tube is made of medical hard material , the first outer tube and the second outer tube are made of medical hard material, and the side walls of the first outer tube and/or the second outer tube are provided with elastic slits for contraction or expansion of the tube wall , the elastic slit is set through the pipe wall.

The present invention is further configured as follows: the fixing device includes an overturn buckle arm with one end hinged on the outer side wall of the sleeve half pipe, and a torsion spring for driving the other end of the overturn buckle arm to fit on the outer side wall of the sleeve half tube The end of the flip buckle arm away from the hinged end is provided with a fastening block for fastening on the outer wall of the clamp end, and the flip buckle arm is turned outward around the hinge until the length direction of the flip buckle arm is in line with the casing When the length direction is vertical, the distance from the inner side wall of the fastening block to the outer side wall of the casing is suitable for the thickness of the pipe wall of the clamp; when the flipping buckle arm is turned outward around the hinge, the flipping buckle arm is in the Under the action force of the torsion spring, it is buckled with the clamp sleeved on the casing, and the inner side wall of the fastening block is always in contact with the outer side wall of the clamp.

The present invention is further configured as follows: a positioning groove is provided on the inner side wall of the fastening block close to the side of the turning buckle arm, and a positioning convex ring that can be fastened to the positioning groove is protruded on the outer side wall of the clip , the width dimension of the positioning protruding ring is adapted to the width dimension of the positioning groove; the positioning protruding ring can be embedded in the positioning groove during the process of buckling the flip buckle arm with the clamp under the force of the torsion spring.

The present invention is further configured as follows: the outer side wall of the sleeve half-pipe is provided with an embedding groove for embedding the overturning buckle arm, the depth dimension of the embedding groove is adapted to the thickness dimension of the overturning buckle arm. During the flipping process of the buckle arm around the hinge to the outer side wall of the sleeve half pipe, the flip buckle arm is embedded in the scarfing groove under the force of the torsion spring.

The present invention is further configured as follows: the end of the sleeve tube facing the cutting end is provided with a positioning tube for insertion into the muscle tissue, the positioning tube includes two symmetrically arranged positioning half-pipes, and the positioning half-pipe is located at the sleeve half-pipe Towards the end of the cutting end, the cross-section of the positioning half-pipe along its length direction is arranged in a semi-circular ring structure, and the opening ends of the two positioning half-pipes also abut against each other during the process of abutting the opening ends of the two positioning half-pipes to form a positioning When the needle core is inserted into the casing, the cutting end extends from the end of the positioning tube after penetrating the casing, and the operating end also extends from the tail end of the casing; the outer diameter of the positioning tube is from the positioning tube From the end to the joint between the positioning tube and the casing, the setting increases gradually, and the end surface of the positioning tube is set in an inclined surface structure.

The present invention is further provided that: the positioning tube and the outer wall of the end of the needle core are both provided with a titanium coating with good biocompatibility.

The present invention is further provided that: the negative pressure detection device includes a syringe communicated with the infusion tube and a pressure measuring tube for detecting the pressure in the infusion tube.

The present invention is further set as: both sides of the open end of the sleeve half-pipe are protrudingly provided with limit strips, the width of the limit strips is half of the thickness of the tube wall of the sleeve half-pipe, and one of the limit strips is located at The inner side of one end face, and the other limiting strip is located on the outer side of the other end face.

In summary, the present invention has the following beneficial effects: when in use, the two sleeve half-pipes are fastened to the outer wall of the needle core, the clamp is fixed on the sleeve tube by the fixing device, and the detection liquid is detected by the negative pressure detection device. Inject it into the infusion channel through the infusion tube, and then rotate the control core to push the sliding core to slide in the outer core of the needle through the connecting core. During this process, the cutting edge will gradually protrude from the outer wall of the cutting end. After the puncture is in place, carry out the abdominal puncture operation. During the puncture operation, hold the operating end to puncture the cutting end into the abdominal cavity. Being put into the avoidance groove can not only stop the movement of the trocar, but also avoid contact with the sharp cutting edge due to the beating of the abdominal viscera when the cutting edge is close to the abdominal viscera, which is beneficial to improve the puncture of the trocar safety. When the cut end is punctured into the abdominal cavity, due to the negative pressure in the abdominal cavity, the detection fluid in the infusion channel will flow into the abdominal cavity, and this situation can be observed from the infusion tube or negative pressure detection device, so it indicates needle core puncture In place, so as to prevent the trocar from injuring the abdominal viscera, then withdraw the needle core from the cannula, and then send the dialysis catheter into the abdominal cavity through the cannula, and remove the clamp after reaching the position, so as to facilitate the connection of the two half-cannula The dialysis catheter is detached and the clamp is removed from the other end of the dialysis catheter, ultimately securing the dialysis catheter.

The trocar is easy to operate, fast and convenient, safe and reliable, and has a small incision, which not only reduces the pain of the patient, but also avoids damage to the patient's abdominal organs, which can reduce and avoid complications. The wound heals quickly after extubation, and the trauma Small. It is especially suitable for patients with acute and severe "acute and chronic renal failure uremia" with coagulation dysfunction.

Description of drawings

Fig. 1 is the exploded structure schematic diagram of peritoneal dialysis trocar;

Figure 2 is a sectional view of the needle core;

Fig. 3 is a schematic diagram of the enlarged structure of part A in Fig. 2;

Fig. 4 is a sectional view when the sliding core and the needle outer core cooperate (the cutting edge protrudes from the outer wall of the cutting end);

Figure 5 is a top view of the cutting end;

Fig. 6 is a structural schematic diagram of a negative pressure detection device;

Fig. 7 is a structural schematic diagram of the connection between the first infusion tube and the second infusion tube;

Fig. 8 is a schematic structural view of the second outer tube;

Fig. 9 is a cross-sectional view at the fixing device;

Figure 10 is a cross-sectional view along the length of the casing.

Reference signs: 1, casing; 11, sleeve half pipe; 111, embedding groove; 112, limit bar; 12, fixing device; 121, flip buckle arm; 122, buckle block; 123, positioning groove 13, positioning tube; 131, positioning half tube; 2, needle core; 21, needle outer core; 211, cutting end; 2111, avoidance groove; 2112, infusion hole; 212, operating end; 22, needle inner core; , sliding core; 2211, cutting edge; 222, regulating core; 2221, regulating end; 223, connecting core; 23, infusion channel; 3, clip; 31, positioning convex ring; 4, infusion tube; 41, infusion Tube; 411, the first inner tube; 412, the first outer tube; 4121, the first fastening ring; 413, the first gap; 42, the second infusion tube; 421, the second inner tube; 422, the second outer tube; 4221, the second fastening ring; 423, the second gap; 43, the elastic gap; 5, the negative pressure detection device; 51, the syringe; 52, the pressure measuring tube.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. Wherein the same components are denoted by the same reference numerals. It should be noted that the words "front", "rear", and

"Left", "right", "upper" and "lower" refer to directions in the drawings, and the words "bottom" and "top", "inner" and "outer" mean towards or away from a particular part, respectively The direction of the geometric center.

Referring to Figures 1-10, a peritoneal dialysis trocar includes a sleeve 1 and a needle core 2 inserted into the sleeve 1. The sleeve 1 includes two symmetrically arranged half-tubes 11. The cross section of the half pipe 11 along its length direction is arranged in a semicircular ring structure, and the opening ends of the two sleeve half pipes 11 are joined together to form a sleeve 1, and a clamp 3 is sleeved on the outer wall of the sleeve 1, and the sleeve 1 There is a fixing device 12 for fixing the clamp 3; the clamp 3 is used to cover the two sleeve half-pipes 11, so that the two sleeve half-pipes 11 can be buckled into the casing 1, and the fixing device 12 is used to realize the clamp 3 is fixed on the cannula 1, so as to prevent the use of the cannula 1 needle from being affected by the movement of the clamp 3 or even falling from the cannula 1 during use.

The needle core 2 includes a cutting end 211 located at the head end for cutting an incision and an operating end 212 located at the tail end for operating the needle core 2 , and the cutting end 211 penetrates the sleeve tube 1 when the needle core 2 is inserted into the casing 1 The end of the sleeve tube 1 is extended afterward, and the operating end 212 is also extended from the tail end of the sleeve tube 1; the cutting end 211 is used to directly puncture the abdomen, and the length of the entire needle core 2 is longer than the length of the sleeve tube 1, so that both sides Both ends can protrude from both ends of the cannula 1, and the outer wall of the operating end 212 can be provided with friction lines, which are used to enhance the friction when the doctor touches the operating end 212, which is conducive to improving the use stability of the cannula 1 needle.

The needle core 2 includes a tubular needle outer core 21 and a needle inner core 22 inserted in the needle outer core 21. The cutting end 211 is arranged in a conical structure and is located at the end of the needle outer core 21. The small diameter end of the cutting end 211 Located at the top of the needle outer core 21, the needle inner core 22 includes a sliding core 221 sliding in the needle outer core 21, a regulating core 222 screwed to the needle outer core 21, and an axially fixed and circumferentially rotating Connected to the connecting core 223 between the sliding core 221 and the regulating core 222, the regulating core 222 includes a regulating end 2221 extending out of the outer needle core 21, and the regulating core 222 can pass through the connecting core during the rotation of the needle outer core 21. 223 drives the sliding core 221 to slide in the needle outer core 21 along the length direction of the sliding core 221; the outer side wall of the end of the sliding core 221 away from the connecting core 223 is protrudingly provided with several cutting edges 2211, and the length of the cutting edge 2211 The direction is consistent with the length direction of the needle inner core 22, and the cutting end 211 is provided with an escape groove 2111 for the cutting edge 2211 to extend outward, and the cutting edge 2211 can be embedded in the process of sliding the sliding core 221 into the needle outer core 21 Avoid in the groove 2111 until the cutting edge 2211 protrudes from the outer side wall of the cutting end 211; during the puncture operation, the cutting edge 2211 can extend from the outer side wall of the cutting end 211 when the needle inner core 22 slides into the needle outer core 21. so that when the medical staff punctures the abdomen, the cannula 1 needle can be inserted into the abdominal cavity through the cutting edge 2211 on the outer wall of the cutting end 211, and the cutting edge 2211 arranged along the length direction of the needle core 2 can be easily scratched during the puncture process. Therefore, the sharp cutting edge 2211 can greatly reduce the resistance when the trocar 1 needle is punctured, thereby facilitating the control of the puncture depth by medical personnel, and can effectively avoid the trocar 1 needle from injuring abdominal viscera.

In addition, in the process of pulling out the needle core 2, the needle inner core 22 can be slid out from the needle outer core 21 first, and the cutting edge 2211 is put into the avoidance groove 2111, so as to prevent the cutting edge 2211 from scratching abdominal viscera.

The needle core 2 is coaxially provided with an infusion channel 23 for infusion. One end of the infusion channel 23 runs through the operating end 212 and is sealed with the infusion tube 4 . The other end leads to the cutting end 211 to form a blind hole structure. There are a plurality of infusion holes 2112 connected with the infusion channel 23, one end of the infusion hole 2112 is connected with the infusion channel 23, and the other end runs through the outer wall of the cutting end 211; The negative pressure detection device 5 that injects the detection liquid, the negative pressure detection device 5 can flow the detection liquid in the infusion channel 23 out from the infusion hole 2112 . The negative pressure detection device 5 can fill the infusion channel 23 with detection liquid such as physiological saline or dialysate through the infusion tube 4 with a certain pressure. When the cutting end 211 punctures into the abdomen, the detection liquid can be injected into the abdomen, and this The situation can be observed from the infusion tube 4 or the negative pressure detection device 5, thus indicating that the needle core 2 is punctured in place, thereby preventing the cannula 1 needle from injuring the abdominal viscera.

When in use, the two sleeve half tubes 11 are fastened to the outer side wall of the needle core 2, the clamp 3 is fixed on the sleeve tube 1 through the fixing device 12, and the detection liquid is injected into the tube 4 by the negative pressure detection device 5. In the infusion channel 23, the control core 222 is then rotated to push the sliding core 221 to slide in the needle outer core 21 through the connecting core 223. After the core 221 slides into place, the abdominal puncture operation is performed. During the puncture operation, hold the operating end 212 to make the cutting end 211 puncture into the abdominal cavity. During the puncture process, if it is necessary to pause the puncture to check whether the puncture is in place, it can be reversely rotated to adjust The core 222 allows the cutting edge 2211 to be retracted into the escape groove 2111, which not only allows the cannula 1 needle to stop moving, but also prevents the cutting edge 2211 from colliding with the sharp cutting edge 2211 due to the beating of the abdominal viscera when the cutting edge 2211 is close to the abdominal viscera. Touch, which is conducive to improving the safety of the puncture of the cannula 1 needle. When the cutting end 211 punctures into the abdominal cavity, due to the negative pressure in the abdominal cavity, the detection liquid in the infusion channel 23 will flow into the abdominal cavity, and this situation can be observed from the infusion tube 4 or the negative pressure detection device 5, so It indicates that the needle core 2 is punctured in place, so as to prevent the cannula 1 needle from injuring the abdominal viscera. Then the needle core 2 is pulled out from the cannula 1, and then the dialysis catheter is sent into the abdominal cavity through the cannula 1. After reaching the position, the card is removed. The hoop 3 facilitates the separation of the two half-tubes 11 from the dialysis catheter, and the hoop 3 is removed from the other end of the dialysis catheter to finally fix the dialysis catheter.

The cannula with one needle is easy to operate, fast and convenient, safe and reliable, and the incision is small, which not only reduces the pain of the patient, but also avoids damage to the patient's abdominal organs, can reduce and avoid complications, and the wound heals quickly after extubation. Trauma. It is especially suitable for patients with acute and severe "acute and chronic renal failure uremia" with coagulation dysfunction.

The infusion tube 4 includes a first infusion tube 41 communicated with the infusion channel 23 and a second infusion tube 42 connected to the negative pressure detection device 5. The first infusion tube 41 is used to connect the second infusion tube 42. The inner tube 411 and the first outer tube 412, the end face of the first inner tube 411 is located in the first outer tube 412; the second infusion tube 42 is used to connect the interface of the first infusion tube 41 with a coaxial second inner tube 421 and The second outer tube 422, the end surface of the second inner tube 421 is located in the second outer tube 422, and there is a first gap 413 for the second outer tube 422 to be inserted between the first inner tube 411 and the first outer tube 412. There is a second gap 423 for inserting the first inner tube 411 between the two inner tubes 421 and the second outer tube 422; Located in the second outer tube 422, the first inner tube 411 and the second inner tube 421 can be completely wrapped by adding the first outer tube 412 and the second outer tube 422 respectively, and the first infusion tube 41 and the second infusion tube 42 are connected At this time, the connection between the first inner tube 411 and the second inner tube 421 can be controlled by directly contacting the first outer tube 412 and the second outer tube 422, which not only facilitates the connection operation, but also effectively avoids accidental contact with the first infusion tube. 41 and the interface of the second infusion tube 42, thereby avoiding the infection or peritonitis caused by contacting the interface and causing viruses or foreign objects to enter the abdominal cavity, and the use safety performance of the infusion tube 4 can be greatly enhanced. Moreover, the interface between the first infusion tube 41 and the second infusion tube 42 is provided with a multi-layer structure, so that the structural strength of the interface is high, and it is not easy to bend, which is conducive to the smooth circulation of the detection liquid.

The end of the second inner tube 421 is arranged in a conical structure, and the small-diameter end of the second inner tube 421 faces the first inner tube 411, and the outer diameter of the second inner tube 421 is smaller than the inner diameter of the first inner tube 411. And the outer diameter of the large-diameter end of the second inner tube 421 is greater than the inner diameter of the first inner tube 411; the outer wall of the second inner tube 421 abuts against the end of the first inner tube 411 to achieve a collision seal, and this structure makes the infusion a The tube 41 and the second infusion tube 42 can realize fast sealing connection, which is beneficial to improve the sealing efficiency and sealing effect.

The first outer tube 412 is used to connect the connecting end of the second outer tube 422 with a first buckle ring 4121 protruding on the inner wall, and the second outer tube 422 is used to connect the connecting end of the first outer tube 412. There is a second fastening ring 4221. When the second outer tube 422 is inserted into the first gap 413, the first fastening ring 4121 slides over the second fastening ring 4221 and then is fastened with the second fastening ring 4221, and the first When the fastening ring 4121 is fastened to the second fastening ring 4221 , the tapered outer wall of the second inner tube 421 can keep abutting against and sealing the opening end of the first inner tube 411 . When the first transfusion tube 41 is connected to the second transfusion tube 42, the first fastening ring 4121 is fastened to the second fastening ring 4221, and the tapered outer sidewall of the second inner tube 421 is kept in contact with the opening end of the first inner tube 411. This structure is not only easy to assemble and disassemble, even when the infusion tube 41 rotates with the rotation of the needle core 2, the first fastening ring 4121 can rotate with the second fastening ring 4221 in a fastened state, and at the same time The tapered outer sidewall of the second inner tube 421 can also keep in contact with the opening end of the first inner tube 411 in a sealed state, so the connection between the first infusion tube 41 and the second infusion tube 42 can always maintain a sealing effect during the rotation process, Therefore, it is beneficial to improve the sealing stability of the joint of the infusion tube 4 .

The connection between the first infusion tube 41 and the second infusion tube 42 is located in the middle of the infusion tube 4, so as to avoid accidental contact with the connection when the needle core 2 is operated, which may cause the connection to be easily detached; the first inner tube 411 is formed by Made of medical elastic plastic, such as soft PVC; the second inner tube 421 is made of medical hard material, and the first outer tube 412 and the second outer tube 422 are made of medical hard material, such as hard PVC; The side wall of the tube 412 and/or the second outer tube 422 is provided with an elastic slit 43 for shrinking or expanding the tube wall, and the elastic slit 43 is provided through the tube wall. When the first fastening ring 4121 and the second fastening ring 4221 are fastened together, the diameter of the first outer tube 412 and/or the second outer tube 422 will increase or shrink, and the hard first The first outer tube 412 and the second outer tube 422 can be deformed, so as to facilitate the fastening of the first fastening ring 4121 and the second fastening ring 4221 .

The fixing device 12 includes a flip buckle arm 121 with one end hinged on the outer side wall of the sleeve half pipe 11, and a torsion spring that is used to drive the other end of the flip buckle arm 121 to fit on the outer side wall of the sleeve half tube 11, and the flip buckle One end of the connecting arm 121 away from the hinged end is provided with a fastening block 122 for fastening on the outer side wall of the end of the clamp 3, and the turning buckling arm 121 is turned outward around the hinge until the length direction of the turning buckling arm 121 is in line with the casing. When the length direction of 1 is vertical, the distance from the inner side wall of the fastening block 122 to the outer side wall of the casing 1 is suitable for the thickness of the pipe wall of the clamp 3; during the process of turning the buckle arm 121 outward around the hinge Under the force of the torsion spring, the overturning buckle arm 121 is buckled with the clamp 3 sleeved on the sleeve 1 , and the inner sidewall of the buckle block 122 is always in contact with the outer sidewall of the buckle 3 . After the clamp 3 is sleeved on the casing 1, the turning arm 121 is turned outward and then fastened to the end of the clamp 3. At this time, the fastening block 122 abuts against the outer wall of the clamp 3, thereby The clamp 3 is fixed on the sleeve 1 by turning over the buckle arm 121 , and can effectively prevent the clamp 3 from shaking on the sleeve 1 , which is beneficial to improving the firmness of the fixing device 12 .

The inner side wall of the fastening block 122 near the side of the buckle arm 121 is provided with a positioning groove 123, and the outer wall of the clip 3 is provided with a positioning convex ring 31 that can be fastened by the positioning groove 123, and the positioning convex ring The width dimension of 31 is adapted to the width dimension of the positioning groove 123; the positioning protruding ring 31 can be embedded in the positioning groove 123 during the buckling process of the overturning buckle arm 121 and the clip 3 under the force of the torsion spring. The fastening block 122 is fastened on the outer wall of the clamp 3, and the positioning protruding ring 31 is embedded in the positioning groove 123, which is conducive to improving the fastening stability of the fastening block 122, and further helps to improve the firmness of the fixing device 12. degree. The setting of the positioning convex ring 31 can facilitate the fastening of the turning arm 121 to any outer wall of the clamp 3 , which is beneficial to simplify the buckling operation of the turning arm 121 .

The outer wall of the sleeve half-pipe 11 is provided with an embedding groove 111 for inserting the overturning buckle arm 121. The depth dimension of the embedding groove 111 is adapted to the thickness dimension of the overturning buckle arm 121, and the overturning buckle arm 121 wraps around During the flipping process of the hinge point towards the outer side wall of the sleeve half-pipe 11 , the flipping buckle arm 121 is inserted into the embedding groove 111 under the force of the torsion spring. The overturning buckle arm 121 is embedded in the embedding groove 111, which can facilitate the clip 3 to slide over the casing 1, thereby facilitating the detachment of the two half-tubes 11 from the dialysis catheter.

The end of the sleeve tube 1 facing the cutting end 211 is provided with a positioning tube 13 for insertion into the muscle tissue. The positioning tube 13 includes two symmetrically arranged positioning half-pipes 131. The end of the positioning half-pipe 131 is arranged in a semi-circular structure along the cross-section of its length direction, and the opening ends of the two positioning half-pipes 131 are also abutted against during the process of abutting the opening ends of the two sleeve half-pipes 11 to form a positioning tube 13. When the needle core 2 is inserted into the sleeve 1, the cutting end 211 extends from the end of the positioning tube 13 after penetrating the sleeve 1, and the operating end 212 also extends from the tail end of the sleeve 1; the positioning tube 13 The needle core 2 is configured to be inserted into the muscle tissue from the incision after the needle core 2 is punctured out of the incision, so as to position the cannula 1 and facilitate the extension of the dialysis catheter into the abdominal cavity. The outer diameter of the positioning tube 13 gradually increases from the end of the positioning tube 13 to the connection between the positioning tube 13 and the sleeve 1, and the end surface of the positioning tube 13 is arranged in an inclined surface structure. The conical positioning tube 13 provided by the above structure can facilitate its insertion into the muscle tissue. During the process of inserting the positioning tube 13 into the muscle tissue from the incision, the positioning tube 13 can enable the muscle tissue around the incision to spread to the periphery, which is conducive to reducing trauma. incision.

A titanium coating with good biocompatibility is provided on the outer side walls of the positioning tube 13 and the end of the needle core 2 . This enables the positioning tube 13 and the needle core 2 to avoid reaction in the abdominal cavity when they are inserted into the abdominal cavity, thereby increasing the safety and stability of the trocar.

The negative pressure detection device 5 includes a syringe 51 communicating with the infusion tube 4 and a pressure measuring tube 52 for detecting the pressure in the infusion tube 4 . The negative pressure detection device 5 is used to inject the detection liquid into the infusion channel 23. You can refer to the use of the infusion bottle infusion set. By observing the dropper of the infusion bottle infusion set, you can easily observe whether the detection liquid in the infusion channel 23 is injected into the abdominal cavity. and the syringe 51 and the pressure measuring tube 52 that the negative pressure detection device 5 includes in the present application can also form a certain pressure of the detection liquid in the infusion tube 4 through the syringe 51, and display it through the pressure measuring tube 52, when the needle core 2 When piercing into the abdominal cavity, the detection liquid in the infusion tube 4 will be injected into the abdominal cavity, and the level of the detection liquid in the pressure measuring tube 52 will also drop accordingly, which is convenient for the medical staff to observe the position of the needle core 2 more intuitively.

Both sides of the open end of the sleeve half-pipe 11 are protrudingly provided with limit strips 112. The width of the limit strips 112 is half of the thickness of the tube wall of the sleeve half-pipe 11, and one of the limit strips 112 is located on the inner side of one end surface. , the other limiting strip 112 is located outside the end surface of the other side. The setting of the limit bar 112 can facilitate the accurate fastening of the two sleeve half-pipes 11 , avoiding the dislocation of the two sleeve half-pipes 11 and affecting the assembly efficiency of the sleeve clamp 3 . Moreover, the two half-pipes 11 are arranged in a center-symmetrical structure. When processing the half-pipe 11, only one pair of processing molds needs to be set to assemble a set of half-pipe 11, which is beneficial to reduce processing costs.

The above are only preferred implementations of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions under the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention should also be regarded as the protection scope of the present invention.

Claims (10)

1. A trocar for peritoneal dialysis, comprising a sleeve (1) and a needle core (2) inserted in the sleeve (1), characterized in that: the sleeve (1) includes two symmetrical The set half-pipe (11), the cross-section of the half-pipe (11) along its length is arranged in a semi-circular structure, and the open ends of the two half-pipes (11) are joined together to form a sleeve (1) , the outer wall of the casing (1) is sleeved with a clip (3), and the casing (1) is provided with a fixing device (12) for fixing the clip (3); The needle core (2) includes a cutting end (211) at the head end for cutting out an incision and an operating end (212) at the tail end for operating the needle core (2), and the needle core (2) is inserted into the sleeve During the process in (1), the cutting end (211) extends out of the end of the sleeve (1) after penetrating through the sleeve (1), and the operation end (212) also extends from the tail end of the sleeve (1); The needle core (2) includes a tubular needle outer core (21) and a needle inner core (22) inserted into the needle outer core (21), and the cutting end (211) is arranged in a conical structure and located at The end of the needle outer core (21), the small diameter end of the cutting end (211) is located at the top of the needle outer core (21), and the needle inner core (22) includes a The sliding core (221), and the regulating core (222) screwed with the needle outer core (21), and the axially fixed and circumferentially rotating connection between the sliding core (221) and the regulating core (222) The connecting core (223), the regulating core (222) includes a regulating end (2221) extending out of the outer needle core (21), and the regulating core (222) can pass through the needle outer core (21) during the rotation process The connecting core (223) drives the sliding core (221) to slide in the needle outer core (21) along the length direction of the sliding core (221); A plurality of cutting edges (2211) protrude from the outer wall of the end of the sliding core (221) away from the connecting core (223), and the length direction of the cutting edges (2211) is aligned with the length direction of the needle inner core (22). To be consistent, the cutting end (211) is provided with an escape groove (2111) for the cutting edge (2211) to extend outwards, and the cutting edge (2111) slides into the needle outer core (21) during the sliding core (221) (2211) can be embedded in the escape groove (2111) until the cutting edge (2211) protrudes from the outer side wall of the cutting end (211); The needle core (2) is coaxially provided with an infusion channel (23) for infusion, one end of the infusion channel (23) runs through the operating end (212) and is sealed with an infusion tube (4), and the other end leads to the The cutting end (211) is arranged in a blind hole structure, and the cutting end (211) is provided with a plurality of infusion holes (2112) connected with the infusion channel (23); The other end of the infusion tube (4) is sealingly connected with a negative pressure detection device (5) for injecting detection liquid into the infusion channel (23), and the negative pressure detection device (5) can detect the detection liquid in the infusion channel (23). The liquid flows out from the infusion hole (2112). 2. A kind of peritoneal dialysis trocar according to claim 1, characterized in that: said transfusion tube (4) includes a transfusion tube (41) communicated with the transfusion channel (23) and a negative pressure detection device (5) two connected infusion tubes (42), the first infusion tube (41) is provided with a coaxial first inner tube (411) and a first outer tube ( 412), the end face of the first inner tube (411) is located in the first outer tube (412); the second infusion tube (42) is used to connect the first infusion tube (41) at the interface to be provided with a coaxial first Two inner tubes (421) and a second outer tube (422), the end face of the second inner tube (421) is located in the second outer tube (422), the first inner tube (411) and the first outer tube There is a first gap (413) between (412) for the insertion of the second outer tube (422), and there is a space between the second inner tube (421) and the second outer tube (422) for the first inner tube (411) inserted second gap (423); The second inner tube (421) is arranged in a conical structure, and the small-diameter end of the second inner tube (421) faces the first inner tube (411), and the outer diameter of the small-diameter end of the second inner tube (421) is smaller than The inner diameter of the first inner tube (411), and the outer diameter of the large diameter end of the second inner tube (421) is greater than the inner diameter of the first inner tube (411); The inner wall of the connection end of the first outer tube (412) used to connect to the second outer tube (422) is provided with a first fastening ring (4121), and the second outer tube (422) is used to connect to the second outer tube (422). A second fastening ring (4221) protrudes from the outer wall of the connecting end of an outer tube (412), and the first fastening ring (4121) is inserted into the first gap (413) when the second outer tube (422) is inserted into the first gap (413). After sliding over the second fastening ring (4221), it is fastened with the second fastening ring (4221), and when the first fastening ring (4121) is fastened with the second fastening ring (4221), the second inner tube (421 ) can be kept in abutment and sealed with the open end of the first inner tube (411). 3. a kind of peritoneal dialysis trocar according to claim 2, is characterized in that: the joint of described infusion first pipe (41) and infusion second pipe (42) is positioned at the middle part of infusion pipe (4), and described The first inner tube (411) is made of medical elastic plastic, the second inner tube (421) is made of medical hard material, and the first outer tube (412) and the second outer tube (422) are made of Made of medical hard material, the side walls of the first outer tube (412) and/or the second outer tube (422) are provided with elastic cracks (43) for contraction or expansion of the tube wall, and the elastic cracks (43) set through the pipe wall. 4. A kind of peritoneal dialysis trocar according to any one of claims 1-3, characterized in that: said fixing device (12) includes an overturning with one end hinged on the outer side wall of the sleeve half-pipe (11) The buckle arm (121) and the torsion spring used to drive the other end of the flip buckle arm (121) to be attached to the outer side wall of the sleeve half pipe (11), and the flip buckle arm (121) is far away from the end of the hinged end A fastening block (122) for fastening on the outer side wall of the end of the clamp (3) is provided, and the turning buckling arm (121) is turned outward around the hinge until the length direction of the turning buckling arm (121) is in line with the sleeve When the length direction of the pipe (1) is vertical, the distance from the inner wall of the fastening block (122) to the outer wall of the casing (1) is compatible with the thickness of the pipe wall of the clamp (3); During the outward turning process of the flip buckle arm (121) around the hinge, the flip buckle arm (121) is buckled with the clamp (3) sleeved on the sleeve (1) under the force of the torsion spring, and the buckle The inner side wall of the connection block (122) and the outer side wall of the clamp (3) are always in contact. 5. A peritoneal dialysis trocar according to claim 4, characterized in that: a positioning groove (123) is provided on the inner side wall of the fastening block (122) close to the flipping fastening arm (121) ), the outer wall of the clamp (3) is protrudingly provided with a positioning protruding ring (31) that can be fastened to the positioning groove (123), and the width dimension of the positioning protruding ring (31) is the same as that of the positioning groove ( 123) is suitable for the width dimension; the positioning protruding ring (31) can be embedded in the positioning groove (123) during the fastening process of the overturning buckle arm (121) and the clamp (3) under the force of the torsion spring. 6. A peritoneal dialysis trocar according to claim 4, characterized in that: the outer wall of the sleeve half tube (11) is provided with a scarfing groove ( 111), the depth dimension of the embedding groove (111) is adapted to the thickness dimension of the overturning buckle arm (121), and the overturning buckle arm (121) is turned around the hinge to the outer side wall of the sleeve half pipe (11) During the process, the overturning buckle arm (121) is embedded in the embedding groove (111) under the active force of the torsion spring. 7. A peritoneal dialysis trocar according to claim 1, characterized in that: the end of the sleeve (1) towards the cutting end (211) is provided with a positioning tube (13) for insertion into muscle tissue , the positioning tube (13) includes two symmetrical positioning half tubes (131), the positioning half tube (131) is located at the end of the sleeve half tube (11) towards the cutting end (211), the positioning The half-pipe (131) is arranged in a semi-circular structure along the cross-section of its length direction, and the opening ends of the two positioning half-pipes (131) are also abutted against during the abutment process of the opening ends of the two sleeve half-pipes (11) to form a positioning circle. Tube (13), the cutting end (211) extends from the end of the positioning tube (13) after the needle core (2) is inserted into the sleeve tube (1) through the sleeve tube (1), and the operating end (212) Also extends from the tail end of the casing (1); The outer diameter of the positioning tube (13) is gradually increased from the end of the positioning tube (13) to the junction of the positioning tube (13) and the sleeve (1), and the end surface of the positioning tube (13) is formed Inclined face structure setup. 8. A peritoneal dialysis trocar according to claim 7, characterized in that: the outer wall of the positioning tube (13) and the end of the needle core (2) are all provided with titanium with good biocompatibility coating. 9. A kind of peritoneal dialysis trocar according to claim 1, characterized in that: the negative pressure detection device (5) includes a syringe (51) communicated with the infusion tube (4) and is used to detect the infusion tube (4) The pressure measuring tube (52) of internal pressure. 10. A peritoneal dialysis trocar according to claim 1, characterized in that: limit strips (112) are protrudingly provided on both sides of the open end of the sleeve half tube (11), and the limit strips The width dimension of (112) is half of the pipe wall thickness dimension of sleeve half pipe (11), and wherein a limit bar (112) is positioned at the inner side of one side end face, and another limit bar (112) is positioned at the other side end face outside.